S D Young et al.
Journal of medicinal chemistry, 35(10), 1702-1709 (1992-05-15)
A systematic investigation was undertaken to determine the role of the P1' sidechain in a series of hydroxyethylene isostere based inhibitors of HIV-1 protease. Substitution and homologation of the benzyl P1' side chain of the Phe-Phe isostere based pseudo peptides